A faulty transmission control module (TCM) most often causes limp mode with the gearbox stuck in one gear, harsh jolts when you select D or R, erratic gear changes, flashing PRND letters and a gearbox or engine warning light. However, the same symptoms are often caused by a low gearbox oil level, a weak battery, a poor earth or a faulty sensor. To test a transmission control module, start by checking the battery and reading the fault codes with a diagnostic tool that can talk to the gearbox control unit, then check the power supply, the connector, the oil and the live data. Below we explain the symptoms, the diagnostic steps and what the most common fault codes mean.
Engine Control Unit Volkswagen, Skoda Siemens VDO 03D906023B 5WP4084004
Vendors's code: 5WP4084004
Product code: 03D906023B
Barcode:
Code 39:
ISBN:
Select a product option:
Individual variants may differ in price
product option
Important: Depending on the ECU type and vehicle model, not all of the options listed below may be available.
To select the correct option for your vehicle and ECU, please contact us before purchasing:
contact@auto24parts.com
1. Locked
This option is intended for professional workshops with the required specialist equipment and technical knowledge.
The ECU has been removed from a vehicle intended for recycling and still contains the immobilizer data and other information from the previous vehicle. Before it can be used in another car, it must be unlocked and then programmed using specialist automotive diagnostic equipment.
2. Unlocked
Several preparation methods may be available. The possible options depend on the ECU type, vehicle model and immobilizer system. Please contact us before purchasing, as some preparation methods are not available for every ECU.
Our electronics specialists can prepare the ECU in one of the following ways:
a) ECU with PIN code (Car Pass)
The PIN code is supplied, but programming with a suitable diagnostic tool is still required. After installing the ECU, it must be reset using the supplied PIN code and then programmed to the vehicle’s immobilizer system.
b) VIRGIN ECU
The data from the previous vehicle is removed and the ECU is restored to a clean, factory-like state. After installation, it must be programmed to the vehicle using a compatible specialist diagnostic tool. Unless another preparation method is specified in the product description, this is the standard unlocking option for most of our ECUs.
c) Plug & Play – IMMO OFF
The immobilizer function is disabled in the ECU. After installation, the engine can start without additional immobilizer programming. Please note that the vehicle will no longer have an active immobilizer function, and an immobilizer warning light or fault code may remain, depending on the vehicle model.
d) Plug & Play – Automatic Programming
After installation, the ECU automatically learns and saves the required vehicle data. No additional programming is normally required.
e) Plug & Play – 1:1 Clone
The data from your original ECU is copied to another fully functional ECU. The cloned unit is then ready for installation without additional programming.
You must send us your original ECU so that we can transfer its data to the replacement unit.
The original ECU must have working communication with the vehicle, a diagnostic tool or our programming equipment. If the required data cannot be read, a complete 1:1 clone may not be possible.
3. Complete Plug & Play Set
A complete matched set containing the ECU, immobilizer components and all other parts required to start the vehicle without additional programming. All components supplied in the set must be installed in the vehicle.
Important:
Dispatch time depends on the selected option. If an unlocked or specially prepared version is ordered, the preparation service usually requires an additional 1–2 business days.
Ask about the product
Engine Control Unit Volkswagen, Skoda Siemens VDO 03D906023B 5WP4084004
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Price 30 euros applies shipments to 5 kg on worldwide. Above this weight, please contact us by email to check price
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How can you check whether the 03D906023B ECU will fit a Skoda or Volkswagen?
On the label of your current unit, find the VW number and the Siemens VDO number – here 5WP40840 04. If both match, this used petrol engine ECU in working order is the same version.
Engine Control Unit Volkswagen, Skoda Siemens VDO 03D906023B 5WP4084004
The Siemens VDO ECU with VW number 03D906023B runs the petrol engine in Volkswagen and Skoda cars. Based on sensor signals, it calculates fuel quantity and ignition timing, and stores fault codes in memory when something goes wrong. Number 5WP40840 04 is the designation in Siemens VDO / Continental numbering.
Numbers to compare
- 03D906023B – VW part number
- 5WP4084004 – Siemens VDO number, shown on the label as 5WP40840 04
The letter B at the end of the VW number denotes the version. Check it together with the last two digits of the Siemens number – 04.
Typical fault symptoms
- the engine warning light stays on and cleared faults return immediately,
- the engine jerks, loses power or goes into limp mode,
- the tester cannot see the ECU,
- starting problems after water ingress or a voltage spike.
The first step should be measuring the supply voltage and checking the earths – only then replace the unit.
Locked or unlocked version?
There are two versions to choose from. The locked one reaches you with the data and immobiliser of the previous vehicle – an option for workshops that unlock, program and match the unit themselves. The unlocked one is prepared before dispatch, which usually takes 1–2 working days.
The preparation method (PIN / CAR PASS, Virgin, IMMO OFF, auto programming or cloning) depends on the part number, software and immobiliser – not every method is available for the 03D906023B ECU, so please ask us before buying. Description of the options: ECU preparation options.
Questions and answers
| Are Siemens VDO and Continental the same manufacturer? |
|---|
| The 5WP… numbering comes from Siemens VDO, which was later taken over by Continental. For matching, what counts is the number 5WP40840 04 itself and the VW number. |
| What should I send before ordering? |
| A clear photo of your current ECU's label showing all the numbers, and which version you want to order. We'll use this to check the available options. |
| What warranty covers this unit? |
| You will find the warranty period in the product features table. The ECU itself is used, in working order and in good condition. |
Questions about matching? Email contact@auto24parts.com and attach a photo of your ECU's label.
